Re: setenv and let-binding process-environment

[Wolfgang Jenkner]

On Sun, Mar 20 2016, Michael Heerdegen wrote:

>   (let ((process-environment process-environment))
>     (setenv "A" "2"))

This just establishes a new binding to the same object, so the code
works as expected.

The following would give the desired result (but, as you said, consing
the new value to the beginning of process-environment is better).

(let ((process-environment (copy-sequence process-environment)))
  (setenv "A" "2"))